Yeah! go with a 350 holley, it wont let u down!
Handle up to 15PS+, heaps of parts/spares and reasonable cheap too!
To fit a Holley to a stock carby manifold, it's a bit of a hassle, You need to purchase an adapter for a 32/36 webber and also the Holley adapter plate that bolts onto the webber adpater, so...............
bolt the webber adapter plate to the manifold and then bolt the holley adapter to the webber adapter and there you go! for a turbo set-up i recomend welding them all together, to avoid air leaks and handle boost.
But as big d said previously the Holley does sit high in the engine bay, espeically using the method above. My top hat is made from the 350 holley air cleaner,

This is my set up,A14,runs 15psi all day, no fuel regulator yet but it's a very good to drive as a daily driver, still cheap to run just depends on how much boost is applied

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